About global warming and greenhouse gases, we do need to clean up our act, but I fail to see that heavy restrictions on an already underpowered motorcycle, with only around 20 hp, is going to do anything. Problem is, they crack down on us small guys then convince themselves they have done their job. Car manufacturers for years kept us buying big, heavy, overpowered gas guzzlers - only now starting to clean up their act when there may be a profit motive. A completely unmodified old R E is bound to pollute only a fraction of what one of these big autos does, and often both are only carrying one person. I'd like to see some actual stats of measurements from exhaust pipes, comparing the different types, to see what the picture really is.